How to find out and Remove the Duplicate files in my system?

Is the speed and working of the system slow down by the unnecessary files in the system? If yes, there is a simple way to remove those files from the system and make the system speed up. It is nothing but the Duplicate File Detector and the only thing we have to do is to install it in the system and using these, the unnecessary duplicate files like texts, binary, music, video, image and many other such formats can be deleted from the system. For more details log in to the website http:// download.cnet.com/Duplicate-File-Detector/3000-2248_4-10592939.html